Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual é o 1990 que tem um 1993 de 1r?
 ###Tabelas: CREATE TABLE women's_doubles_performance_timeline (women's_doubles_performance_timeline_id AUTO_INCREMENT PRIMARY KEY, Tournament VARCHAR, 1988 VARCHAR, 1989 VARCHAR, 1990 VARCHAR, 1991 VARCHAR, 1992 VARCHAR, 1993 VARCHAR, 1994 VARCHAR, 1995 VARCHAR, 1996 VARCHAR, 1997 VARCHAR, 1998 VARCHAR) CREATE TABLE women's_records (women's_records_id AUTO_INCREMENT PRIMARY KEY, Event VARCHAR, Record VARCHAR, Athlete VARCHAR, Nationality VARCHAR, Date VARCHAR, Meet VARCHAR, Place VARCHAR) CREATE TABLE daytona_500_results (daytona_500_results_id AUTO_INCREMENT PRIMARY KEY, Year INT, Manufacturer VARCHAR, Start VARCHAR, Finish VARCHAR, Team VARCHAR) CREATE TABLE table_of_world_organization_of_the_scout_movement_members (table_of_world_organization_of_the_scout_movement_members_id AUTO_INCREMENT PRIMARY KEY, Country VARCHAR, Membership (from 2010) INT, Name of member organization VARCHAR, Year current Scouting organization joined WOSM VARCHAR, Year member organization was founded VARCHAR, Admits boys/girls VARCHAR) CREATE TABLE iron_coaches (iron_coaches_id AUTO_INCREMENT PRIMARY KEY, Class to 1928 VARCHAR, Class from 1928 VARCHAR, Seats VARCHAR, Quantity INT, Year(s) of Manufacture VARCHAR, Remarks VARCHAR)  
SELECT 1990 FROM women's_doubles_performance_timeline WHERE 1993 = 1r